Improvement in hold-fasts for lathe-spindles



L. R. FAUGHT.

Improvement in Hold Fasts for` Lathe Spndles.

, Patented May 30,1871.

NITED* sTATEs LUTIER It. EAUGHT, OE PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN HOLD-FASTS FOR LATHE-SPINDLES.i

lspeincation forming tart of Letters Patent No. 115,290, dated May 3o, 1871.

'l To all whom 'it may concern:

Beit known that I, LUTHER R. FAUGH'I, of

\ the cityand count-y of-Philadelphia, in the State of Pennsylvania, have invented a certain l v new and usefulImprovementin Hold-Fasts for Lathe-Spindles,of which the following is a specification The object of my invention is to provide a simple and efficient device for tightening-lathespindles in their stocks, in the use of which the spindle shall be held rmly fast or readily released, `as required; the vcentral position of l the spindle shall be constantly maintained and freed from interference caused by its wear and the wear of the stock; the spindle shall be solidly held at a point nearer to its end than is practicable by the ordinary methods; and that ample provision shall be made for taking up the wear of the spindle and stock without reboring or bushing.` To these ends my im- R provement consists in the combination, with a lathe-spindle, of a. splitw conical sleeve itting thereon, and an adjusting-nut which operates the conical sleeve and works upon a screw on theoutside ofthe socket ofthe spindle and at the end adjacent to the point of the spindle. l,

Inthe accompanying drawing, Figure lis a longitudinal central section through a lathe'- stockembracing my improvements; Fig. 2, an

-i-.elevation of the front end of the same; Fig;

'3, a longitudinal Acentral Vsection through a i `lathe-stock, showing a modified form of my i improvement; and Fig. 4, an end elevation of the nut and sleeve of the same.

The stock or socket A is suitably secured to a standard, a, and bored out to receive the stationary lathe-spindle B, which lits accurately within it and is moved longitudinally toward i. i or from the live spindle of the lathe,.as'from i time to time required, by a screw tapped into it,

and operated by a hand-wheel in the ordinary manner. At the end adjacent to the point or center bof the spindle the socket A is bored out to receive a split conical sleeve, G, which is slipped on the spindle, andon its outer sur- From this constructionit is evident that inr v proportion as the conical sleeve is drawn into In the drawing I have-shown two methods of operatingthe sleeve G, the one, Figs. l and 2, being capable of both tightening and slackening its bearing upon the spindle, and the other, Figs. 3 and 4, being only available for tightening. When this latter construction, therefore, is adopted, means must be provided for protruding the sleeve from the stock, which means will readily suggest themselves to a skillful mechanic. Referring to Figs. 1 and2, a nut, D, is shown, which is formed in two parts, Vso that its inwardly-projecting flange d may be slipped into an annular groove on the periphery of the conical sleeve C, near its larger end. A band, D1, slipped over the section', unites them, and is held in position by a bolt or key. In this instance the handle D2, by which the nut is turned, is tapped through the bandinto one of the sections, and thereby serves to unite them. The nut D works upon a screw cut upon the outside of the sockdle is then free to be moved in Vthe socket, as h required. Y

In the arrangement shown in Figs. 3 and 4 the nut is formed in a single piece, and instead of entering a groove in the sleeve merely bears against a shoulder thereon.4 It is plain, therefore, that while it will tighten the bearing of the sleeve upon the spindle, as in the preceding case, it does not afford means of withdrawing the sleeve from the recess, and

will not, therefore, release the spindle. For this reason I prefer the construction shown in Figs. 1V and 2. y

`It will be perceived, by the construction and arrangement herein shown and described, that the operative mechanism is located very near the point or center of the spindle, ,andthe clamping force exerted correspondingly near to this point, at which the greatest strain of the The combination, with the spindle, of the externally-screwed socket, the split conical clamping-sleeve, the adjusting-nut Working in a groove in the sleeve and over the screwed socket, and the clamping-band or its equivalent, substantially as set forth.

L. R. FAUGHT.

Witnesses:

GEO. H. KIRK, J oHN H. REDFIELD. 

